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All the private app files should have been deleted when the app was uninstalled. Anything leftover would live in public storage, like the sdcard (which may or may not refer to an actual physical sdcard). Presumably any app that can access these files, like a file browser, picture gallery, etc., can delete them. You can look for such apps on Google Play.

Use Windows.Storage.ApplicationData.Current.LocalSettings instead of IsolatedStorageSettings.
Also check this post for a Sample (it's for Windows 8 Apps, but should also work with W10).
http://blogs.msdn.com/b/glengordon/archive/2012/09/17/managing-settings-in-windows-phone-and-windows-8-store-apps.aspx

I think you should use File Transfer plugin to download any kinds (video, image, pdf, etc,...).
You can find file transfer plugin at
File Transfer Plugin
Note that you need to use File Plugin also to access file path or create a new folder or whatever you need.

You don't need the StackPanel in the DataTemplate - the Grid you have is enough for this.
Also, in order to get the items to stretch, define a simple ListView.ItemContainerStyle in your ListView:
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
...

Solved in this way :D
FolderLib = await musicFolder.GetFoldersAsync(CommonFolderQuery.GroupByAlbum);
//Obtaining all the folders and do for every folder this
foreach(StorageFolder item in FolderLib)
{ // Take the subfolder
SubFolderlib = await item.GetFilesAsync();
// and do stuff with it
}
FolderLib and SubFolderLib were
public ...

Only thing I know of allowing you to do this would be to create your own Dialer as part of the platform (replacing or modifying InCallUI), I doubt that's what you're trying to do though?
If you are making a platform app, look into this code:
http://androidxref.com/5.1.1_r6/xref/packages/services/Telecomm/src/com/android/server/telecom/Call.java#843

There is no such android API. There's an API for generating it over the speaker, but none for sending it to the other side of the call. THis is a security issue- Android does not allow anyone to access call audio, in either direction.
This might work for windows phone: Windows Phone Phonecall with dtmf
BTW, a good google term to use in your search is ...

XAPs downloaded from the Marketplace are encrypted starting sometime in summer last year. That was also the time when devices that had not installed the WP7.5 update lost access to the Marketplace.
So unless you know the decryption key no: you won't be able to decompile XAP files downloaded from the Marketplace. As for XAPs you get from a Dev directly or ...

If you use the dispatcher then you will execute the given code in the UI thread. And while you execute code in the UI thread, the UI is stuck. There's no way around that, so you must make sure to execute only the absolute minimum amount of code in the UI thread. The common pattern is to retrieve/compute the data in a background thread, then switch to the UI ...

You can declare your phone variable as a global for your class by declaring it at the below of your class declaration as shown below:
class ViewController: UIViewController {
let sharedDefaults = NSUserDefaults.standardUserDefaults()
var phone = ""
}
By declaring this way you can access it anywhere in your class and now you can assign value to ...

@IBAction func phoneButtonPressed(sender: UIButton) {
if let url = NSURL(string: "tel://\(phone)") {
UIApplication.sharedApplication().openURL(url)
}
}
you can use this code if you define the variable phone at the top of your viewController.swift file (below the class call), that way it can be accessed in the function.

Phone and other information is not stored in a sender address.
Re: "An other solution is to add to contacts the sender ..."
The limited amount of information available when creating a contact from scratch is described here http://www.slipstick.com/developer/create-contacts-from-messages/.
This macro is compliments of Outlook MVP and developer Ken Slovak ...

What I've done:
when you want your items in WrapGrid be placed horizontally first, use Orientation=Horizontal,
I've changed the item's grid width to 180, when it was 190 then items were placed vertically, as on my screen the width was too small,
I've changed MaximumRowsOrColumns to 2 as you want two items horizontally,
I've removed the ScrollViewer ...

One possible solution that works with any SIP server is to use PJSUA Python bindings and to implement in Python a basic softphone. Thus your web application will be seen by the SIP server just as a regular soft phone and the server configuration is much easier.

Phone Links
... To prevent users from maliciously redirecting phone calls or
changing the behavior of a phone or account, the Phone app supports
most, but not all, of the special characters in the tel scheme.
Specifically, if a URL contains the * or # characters, the Phone app
does not attempt to dial the corresponding phone number. ...

I remember reading an answer from somebody that Apple doesn't allow you to dial numbers that contain "*" or "#". If I remember the thread correctly, the rationale was that those let you do things like log in to automated phone systems, and that should be under the user's control.

I figured it out. I had to manually set the delay for BackgroundAudioTrack.
Here is the working code:
public async Task<IStorageFile> ConcatenateAudio([ReadOnlyArray]IStorageFile[] audioFiles, IStorageFolder outputFolder, string outputfileName)
{
IStorageFile _OutputFile = await outputFolder.CreateFileAsync(outputfileName, ...